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省略是一种避免重复、突出关键词并使上下文紧密衔接的语法手段。在英语中，从句的省略经常使用，如果不了解这些省略用法，很可能导致对句意的误解。从句的省略一般有以下几种情况：
一、状语从句中的省略
情况一：在状语从句中，如果从句的主语与主句的主语一致，并且从句中含有be动词，通常可以把从句中的主语和be动词一起省略，构成“连词 分词”的形式。分词与主语间为主动关系，用现在分词，即doing的形式；被动关系则用过去分词，即done的形式。我们所熟悉的条件、时间、方式、让步、比较等状语从句均可使用省略形式。常用到的连词有when,oilce,if,unless,though,as,than,as if等。但是，引导时间状语从句的after和before，不能适用于这种形式，他们要么用来引导完整的从句，要么充当介词，后面接名词、代词、动名词。
1.When_____________, the museum will be open to thepublic next year.
A.completed
B.being completed
C.eompleting
D.be completed正确答案是A。
4、Unless___________to speak, you should remain silentat the conference.
A.invited
B.inviting
C.being invited
D.baving invited正确答案是A。
5.The reserch is so designed that once__________nothing can be done to change it.
A.being
B.having begun
C.beginning
D.begun正确答案是D。
7.They came earlier than
A.expeeting
B.expeeted
C.being expected
D.to be expected正确答案是C。
8.The actor threw himself from the horse, as if
A.to be shot
B.being shot
C.shooting
D.shot正确答案是D。
9.The man we followed suddenly stopped to lookaround as if for something.
A.looking for
B.having looked
C.to have looked
D.to look正确答案是A。
情况二：when/whenever/if/ it is adj. (如necessary,possible...)时，常省略it is ,保留“连词 adj.形式。例如:You can drop in and have a chat with mewhenever (it is) convenient to yourself.
10.Don’t always say "yes"or"no". Explain__________possible.
A.whenever B.whatever C.however D.whichever正确答案是c。
二、定语从句中的省略
在定语从句中，如果从句主语和主句的主语一致，或者省略主语完全可以达意时，通常进得省略，构成“引导词 不定式”的形式。
1.My dream is to have a car of my own,______________totravel to any place I like.
A.that Kin which
C.by which
D.how正确答案是B。
2. Bella had inly 1.87 dollars, ________to buy a prerent for her husband, Jim.
A.with which B.in which C.by which D.with it正确答案是A。
三“疑问句 to do” 形式的省
实际上是一个含有should的从句的省略，具有名词短语的作用，在句子中作主语、宾语或表语。
例如:I don’t know how to answer it.(作宾语)
Can you decide which one to buy？(作宾语)
When to finish the job is not deeided.(作主语)
Whether to go out for an outing depends on theweather.(作主语)
总之，省略现象常在选择题、完形填空题和改错题中出现，在阅读理解文章里也是很普遍的一种语法现象，通过以上总结，大家在学习中不断地再认识和摸索，一定能够提高自己的理解能力。
一、状语从句中的省略
情况一：在状语从句中，如果从句的主语与主句的主语一致，并且从句中含有be动词，通常可以把从句中的主语和be动词一起省略，构成“连词 分词”的形式。分词与主语间为主动关系，用现在分词，即doing的形式；被动关系则用过去分词，即done的形式。我们所熟悉的条件、时间、方式、让步、比较等状语从句均可使用省略形式。常用到的连词有when,oilce,if,unless,though,as,than,as if等。但是，引导时间状语从句的after和before，不能适用于这种形式，他们要么用来引导完整的从句，要么充当介词，后面接名词、代词、动名词。
1.When_____________, the museum will be open to thepublic next year.
A.completed
B.being completed
C.eompleting
D.be completed正确答案是A。
4、Unless___________to speak, you should remain silentat the conference.
A.invited
B.inviting
C.being invited
D.baving invited正确答案是A。
5.The reserch is so designed that once__________nothing can be done to change it.
A.being
B.having begun
C.beginning
D.begun正确答案是D。
7.They came earlier than
A.expeeting
B.expeeted
C.being expected
D.to be expected正确答案是C。
8.The actor threw himself from the horse, as if
A.to be shot
B.being shot
C.shooting
D.shot正确答案是D。
9.The man we followed suddenly stopped to lookaround as if for something.
A.looking for
B.having looked
C.to have looked
D.to look正确答案是A。
情况二：when/whenever/if/ it is adj. (如necessary,possible...)时，常省略it is ,保留“连词 adj.形式。例如:You can drop in and have a chat with mewhenever (it is) convenient to yourself.
10.Don’t always say "yes"or"no". Explain__________possible.
A.whenever B.whatever C.however D.whichever正确答案是c。
二、定语从句中的省略
在定语从句中，如果从句主语和主句的主语一致，或者省略主语完全可以达意时，通常进得省略，构成“引导词 不定式”的形式。
1.My dream is to have a car of my own,______________totravel to any place I like.
A.that Kin which
C.by which
D.how正确答案是B。
2. Bella had inly 1.87 dollars, ________to buy a prerent for her husband, Jim.
A.with which B.in which C.by which D.with it正确答案是A。
三“疑问句 to do” 形式的省
实际上是一个含有should的从句的省略，具有名词短语的作用，在句子中作主语、宾语或表语。
例如:I don’t know how to answer it.(作宾语)
Can you decide which one to buy？(作宾语)
When to finish the job is not deeided.(作主语)
Whether to go out for an outing depends on theweather.(作主语)
总之，省略现象常在选择题、完形填空题和改错题中出现，在阅读理解文章里也是很普遍的一种语法现象，通过以上总结，大家在学习中不断地再认识和摸索，一定能够提高自己的理解能力。